<?php

namespace app\common\controller;

class WxService
{
	protected $appid;
	protected $appKey;
	public $data = null;
	public function __construct($appid, $appKey)
	{
		$this->appid = $appid; //微信支付申请对应的公众号的APPID
		$this->appKey = $appKey; //微信支付申请对应的公众号的APP Key
	}

	/**
	 * 通过跳转获取用户的openid，跳转流程如下：
	 * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
	 * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
	 *
	 * @return 用户的openid
	 */

	public function GetOpenid()
	{
		//通过code获得openid
		if (!isset($_GET['code'])) {
			//触发微信返回code码
			$baseUrl = $this->getCurrentUrl();
			$url = $this->__CreateOauthUrlForCode($baseUrl);
			Header("Location: $url");
			exit();
		} else {
			//获取code码，以获取openid
			$code = $_GET['code'];
			$openid = $this->getOpenidFromMp($code);
			return $openid;
		}
	}

	public function getCurrentUrl()
	{
		$scheme = $_SERVER['HTTPS'] == 'on' ? 'https://' : 'http://';
		$uri = $_SERVER['PHP_SELF'] . $_SERVER['QUERY_STRING'];
		if ($_SERVER['REQUEST_URI']) $uri = $_SERVER['REQUEST_URI'];
		$baseUrl = urlencode($scheme . $_SERVER['HTTP_HOST'] . $uri);
		return $baseUrl;
	}

	/**
	 * 通过code从工作平台获取openid机器access_token
	 * @param string $code 微信跳转回来带上的code
	 * @return openid
	 */
	public function GetOpenidFromMp($code)
	{
		$url = $this->__CreateOauthUrlForOpenid($code);
		$res = self::curlGet($url);
		$data = json_decode($res, true);
		$this->data = $data;
		return $data;
	}

	/**
	 * 构造获取open和access_toke的url地址
	 * @param string $code，微信跳转带回的code
	 * @return 请求的url
	 */

	private function __CreateOauthUrlForOpenid($code)

	{
		$urlObj["appid"] = $this->appid;
		$urlObj["secret"] = $this->appKey;
		$urlObj["code"] = $code;
		$urlObj["grant_type"] = "authorization_code";
		$bizString = $this->ToUrlParams($urlObj);
		return "https://api.weixin.qq.com/sns/oauth2/access_token?" . $bizString;
	}

	/**
	 * 构造获取code的url连接
	 * @param string $redirectUrl 微信服务器回跳的url，需要url编码
	 * @return 返回构造好的url
	 */

	private function __CreateOauthUrlForCode($redirectUrl)
	{
		$urlObj["appid"] = $this->appid;
		$urlObj["redirect_uri"] = "$redirectUrl";
		$urlObj["response_type"] = "code";
		$urlObj["scope"] = "snsapi_userinfo";
		$urlObj["state"] = "STATE";
		$bizString = $this->ToUrlParams($urlObj);
		return "https://open.weixin.qq.com/connect/oauth2/authorize?" . $bizString;
	}

	/**
	 * 拼接签名字符串
	 * @param array $urlObj
	 * @return 返回已经拼接好的字符串
	 */

	private function ToUrlParams($urlObj)
	{
		$buff = "";
		foreach ($urlObj as $k => $v) {
			if ($k != "sign") $buff .= $k . "=" . $v . "&";
		}
		$buff = trim($buff, "&");
		return $buff;
	}

	/**
	 * 获取用户信息
	 * @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid
	 * @return string
	 */

	public function getUserInfo($openid, $access_token)
	{
		$response = self::curlGet('https://api.weixin.qq.com/sns/userinfo?access_token=' . $access_token . '&openid=' . $openid . '&lang=zh_CN');
		return json_decode($response, true);
	}

	public static function curlGet($url = '', $options = array())
	{
		$ch = curl_init($url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_TIMEOUT, 30);
		if (!empty($options)) {
			curl_setopt_array($ch, $options);
		}
		//https请求 不验证证书和host
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
		$data = curl_exec($ch);
		curl_close($ch);
		return $data;
	}

	public static function curlPost($url = '', $postData = '', $options = array())
	{
		if (is_array($postData)) {
			$postData = http_build_query($postData);
		}
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
		curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
		if (!empty($options)) {
			curl_setopt_array($ch, $options);
		}
		//https请求 不验证证书和host
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
		$data = curl_exec($ch);
		curl_close($ch);
		return $data;
	}
}
